body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  background-color: #f4f4f9;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}

.container {
  display: flex;
  background: white;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  border-radius: 8px;
  overflow: hidden;
  width: 900px;
  max-width: 95%;
}

/* Панель керування */
.controls {
  width: 300px;
  padding: 20px;
  background-color: #2c3e50;
  color: white;
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.controls h2 {
  margin-top: 0;
  font-size: 1.2rem;
  border-bottom: 1px solid #34495e;
  padding-bottom: 10px;
}

.control-group {
  display: flex;
  flex-direction: column;
}

label {
  margin-bottom: 5px;
  font-size: 0.9rem;
  color: #bdc3c7;
}

input,
select {
  padding: 8px;
  border-radius: 4px;
  border: none;
  font-size: 1rem;
}

/* Кнопки */
button {
  padding: 10px;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 1rem;
  font-weight: bold;
  background-color: #27ae60;
  color: white;
  transition: background 0.2s;
  margin-top: 10px;
}

button:hover {
  background-color: #2ecc71;
}

button.secondary {
  background-color: #c0392b;
}

button.secondary:hover {
  background-color: #e74c3c;
}

/* Клас для приховування елементів */
.hidden {
  display: none;
}

/* Область Canvas */
.canvas-area {
  flex-grow: 1;
  background-color: #ecf0f1;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

canvas {
  background-color: #ffffff;
  box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.05);
  display: block;
}